Unraveling the Mechanism of the Light‐Triggered Synaptic Plasticity in Organic Photoelectric Synaptic Transistors

Author:

Zhang Cong1,Zhang Mingxin2,Lin Fengyuan1,Zhao Guodong2,Wei Zhipeng1,Ni Yanping2,Li Juntong2,Yu Hongyan2,Zhao Xiaoli2,Tong Yanhong2,Tang Qingxin2ORCID,Liu Yichun2

Affiliation:

1. State Key Laboratory of High Power Semiconductor Lasers Changchun University of Science and Technology Changchun 130022 China

2. Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV‐Emitting Materials and Technology of Ministry of Education Northeast Normal University 5268 Renmin Street Changchun 130024 China

Abstract

AbstractLight‐triggered synaptic plasticity (LTSP) induced by electron trapping in organic photoelectric synaptic transistors (OPSTs) offers potential prospects in neuromorphic wearable artificial intelligence. However, a consistent and universal comprehend for LTSP behaviors especially on oxygen effect in OPSTs is still a critical challenge hindering their practical applications. A mechanism on strong dependency between the oxygen‐induced and polar‐group electron trapping in OPSTs, is successfully unveiled in this study for the first time. And the interaction between the oxygen and polar dielectric interface can be enhanced by properly modulating the specific surface area of thin‐film semiconductors. This effectively binds the oxygen near conducting channel and further improves the trapping efficiency for photogenerated electrons, undergoing the time‐dependent photocurrent generation and subsequent prolonged decay, forming the typical LTSP behaviors. These experimental demonstrations differ from previous reports and therefore may contribute an innovative perspective in the design of functional layers for high‐performance OPST devices.

Funder

China Postdoctoral Science Foundation

Natural Science Foundation of Jilin Province

National Basic Research Program of China

National Natural Science Foundation of China

Higher Education Discipline Innovation Project

Fundamental Research Funds for the Central Universities

Publisher

Wiley

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